Effects of Terrain (Region) on Mileage

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Old Jun 3, 2008 | 01:43 PM
  #11  
coolshock1's Avatar
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Default Re: Effects of Terrain (Region) on Mileage

Originally Posted by jayw_TCH
Thanks for the info. This is the kind of info I am curious about. You average 25 MPG and have a bunch of hills. = Better mileage.

I average between 50 and 60 and drive a mostly flat route. = worse mileage.

Does anyone else agree/disagree?
To me it all depends. There are some sweet spots where you can run on ice or ice\EV and hold around between 40 and 60 mpg. At least that's what I have found. If you're on flat ground try and break for a longer than normal distance to get some of the regen effect. That's the key try and plan for regen other than ICE regen.
 
Old Jun 3, 2008 | 02:13 PM
  #12  
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Default Re: Effects of Terrain (Region) on Mileage

Originally Posted by coolshock1
You have to zoom down to a close enough view then it will let you put you start and finish marks in. Also if your commute is far enough you will have to mark it out in sections.
Thanks! That works!
 
Old Jun 3, 2008 | 03:27 PM
  #13  
chestr's Avatar
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Default Re: Effects of Terrain (Region) on Mileage

This was kinda nifty. Have to be careful in some odd little spots and be sure you click on the right part of the road, but still. My commute came out to 16.68 miles with elevations from -16 to 259 ft. Now it's getting close to summer my MFD is currently reading 43+. My more highway route I stopped using was 19.66 miles, max elevation 337. Still got good mileage but definitely better now.
 
Old Jun 3, 2008 | 03:48 PM
  #14  
Mhudak's Avatar
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Exclamation Re: Effects of Terrain (Region) on Mileage

I'm pissed i average 40.6mpg. I live in pa and drive about 150mi 3 days a week highway, mostly flat in NJ. the rest of the week about 20-30/day around a hilly town.
some hints:

START SLOW!! if possible feather touch yourself to 40mph

STAY UNDER 70mph!! you lose efficiency exponentially over 70 mph

GLIDE as much as possible.

(I'm playfully yelling too)
 
Old Jun 3, 2008 | 05:52 PM
  #15  
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Arrow Re: Effects of Terrain (Region) on Mileage

I just got back from a trip to Yosemite from LA. Going there, I averaged 41 mpg, coming back 45 mpg. Since the trip there was uphill, the mileage was worse, but I got it back on the downhill return. I also tracked my mpg thru the Grapevine. Going up the Grapevine, I lost 3 mpg on my tank, but when I went down on the other side, I got it all back. This may be due to the nature of the climbs. I notice when I go to San Francisco, I just get terrible mileage.
 
Old Jun 4, 2008 | 01:45 AM
  #16  
haroldo's Avatar
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Default Re: Effects of Terrain (Region) on Mileage

Originally Posted by H2O Doctor
...Going up the Grapevine, I lost 3 mpg on my tank, but when I went down on the other side, I got it all back. This may be due to the nature of the climbs...
While the car's engine works harder going uphill than it does going down, the swing in MPG might also be due to the slope of the gas in the tank when you are going uphill versus down. When you are going uphill, the gas sloshes to the back of the tank and, depending on where the sensor is located, the car is fooled into thinking you have more (or less) gas than you really have. If it thinks you have more gas, the the calculated mileage statistics (on the dash) will show an increased efficiency.
The gauges range from being a little inaccurate to very innacurate.
Best to take the miles per tank and divide by the gas station's meter to determine mileage.
Anything else (gauges and dials in car) is guesstimates, at best.
 

Last edited by haroldo; Jun 4, 2008 at 04:02 AM.
Old Jun 4, 2008 | 06:24 AM
  #17  
GeorgiaHybrid's Avatar
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From: NW Georgia
Default Re: Effects of Terrain (Region) on Mileage

Haroldo,

I might be wrong but I thought the ECU computed the mpg based upon the mass air flow sensor, manifold absolute pressure sensor and the engine air/fuel ratio. I not positive but I don't think the fuel tank sensor enters in to the calculation at all.
 
Old Jun 4, 2008 | 06:27 AM
  #18  
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From: Mid Hudson Valley, New York
Default Re: Effects of Terrain (Region) on Mileage

Well of course the 5 mile commute is better than 40 mile commute! But, I am very pleased with this car and the fact that I fill-up once a month is a plus...except that I lose track of fuel prices!
 
Old Jun 4, 2008 | 06:30 AM
  #19  
haroldo's Avatar
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Default Re: Effects of Terrain (Region) on Mileage

Originally Posted by GeorgiaHybrid
Haroldo,

I might be wrong but I thought the ECU computed the mpg based upon the mass air flow sensor, manifold absolute pressure sensor and the engine air/fuel ratio. I not positive but I don't think the fuel tank sensor enters in to the calculation at all.
couldn't tell you, since I assumed it was tied into the fuel gauge.
if I'm wrong...it wont be the first time!
 
Old Jun 4, 2008 | 06:46 AM
  #20  
mikieboyblue's Avatar
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From: Mid Hudson Valley, New York
Default Re: Effects of Terrain (Region) on Mileage

Originally Posted by GeorgiaHybrid
Haroldo,

I might be wrong but I thought the ECU computed the mpg based upon the mass air flow sensor, manifold absolute pressure sensor and the engine air/fuel ratio. I not positive but I don't think the fuel tank sensor enters in to the calculation at all.
Well if that is the case, it would explain why it is usually off by one to two miles overall. I would have thought Toyota would have used a fuel flow sensor and the mileage counter. It seems like that would be much more accurate (maybe that is how they calculate the 'instant' FE)?
 


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